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The AWS SDK for Java - Core module holds the classes that are used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.
/*
* Copyright 2010-2024 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.util;
import java.io.InputStream;
import java.util.Properties;
import java.util.jar.JarInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazonaws.annotation.ThreadSafe;
import com.amazonaws.internal.config.InternalConfig;
import static com.amazonaws.util.IOUtils.closeQuietly;
/**
* Utility class for accessing AWS SDK versioning information.
*/
@ThreadSafe
public class VersionInfoUtils {
/** The AWS SDK version info file with SDK versioning info */
static final String VERSION_INFO_FILE = "/com/amazonaws/sdk/versionInfo.properties";
/** SDK version info */
private static volatile String version;
/** SDK platform info */
private static volatile String platform;
/** User Agent info */
private static volatile String userAgent;
/** Shared logger for any issues while loading version information */
private static final Log log = LogFactory.getLog(VersionInfoUtils.class);
private static final String UNKNOWN = "unknown";
/**
* Returns the current version for the AWS SDK in which this class is
* running. Version information is obtained from from the
* versionInfo.properties file which the AWS Java SDK build process
* generates.
*
* @return The current version for the AWS SDK, if known, otherwise
* returns a string indicating that the version information is
* not available.
*/
public static String getVersion() {
if (version == null) {
synchronized(VersionInfoUtils.class) {
if (version == null)
initializeVersion();
}
}
return version;
}
/**
* Returns the current platform for the AWS SDK in which this class is
* running. Version information is obtained from from the
* versionInfo.properties file which the AWS Java SDK build process
* generates.
*
* @return The current platform for the AWS SDK, if known, otherwise
* returns a string indicating that the platform information is
* not available.
*/
public static String getPlatform() {
if (platform == null) {
synchronized(VersionInfoUtils.class) {
if (platform == null)
initializeVersion();
}
}
return platform;
}
/**
* @return Returns the User Agent string to be used when communicating with
* the AWS services. The User Agent encapsulates SDK, Java, OS and
* region information.
*/
public static String getUserAgent() {
if (userAgent == null) {
synchronized(VersionInfoUtils.class) {
if (userAgent == null)
initializeUserAgent();
}
}
return userAgent;
}
/**
* Loads the versionInfo.properties file from the AWS Java SDK and
* stores the information so that the file doesn't have to be read the
* next time the data is needed.
*/
private static void initializeVersion() {
InputStream inputStream = ClassLoaderHelper.getResourceAsStream(
VERSION_INFO_FILE, true, VersionInfoUtils.class);
Properties versionInfoProperties = new Properties();
try {
if (inputStream == null)
throw new Exception(VERSION_INFO_FILE + " not found on classpath");
versionInfoProperties.load(inputStream);
version = versionInfoProperties.getProperty("version");
platform = versionInfoProperties.getProperty("platform");
} catch (Exception e) {
log.info("Unable to load version information for the running SDK: " + e.getMessage());
version = "unknown-version";
platform = "java";
} finally {
closeQuietly(inputStream, log);
}
}
/**
* Initializes the user agent string by loading a template from
* {@code InternalConfig} and filling in the detected version/platform
* info.
*/
private static void initializeUserAgent() {
userAgent = userAgent();
}
static String userAgent() {
String ua = InternalConfig.Factory.getInternalConfig()
.getUserAgentTemplate();
if (ua == null) {
return "aws-sdk-java";
}
ua = ua
.replace("{platform}", StringUtils.lowerCase(getPlatform()))
.replace("{version}", getVersion())
.replace("{os.name}", replaceSpaces(System.getProperty("os.name")))
.replace("{os.version}", replaceSpaces(System.getProperty("os.version")))
.replace("{java.vm.name}", replaceSpaces(System.getProperty("java.vm.name")))
.replace("{java.vm.version}", replaceSpaces(System.getProperty("java.vm.version")))
.replace("{java.version}", replaceSpaces(System.getProperty("java.version")))
.replace("{java.vendor}", replaceSpaces(System.getProperty("java.vendor")))
;
if (ua.contains("{additional.languages}")) {
ua = ua.replace("{additional.languages}", getAdditionalJvmLanguages());
}
String language = System.getProperty("user.language");
String region = System.getProperty("user.region");
String languageAndRegion = "";
if (language != null && region != null) {
languageAndRegion =
" " + replaceSpaces(language) + "_" + replaceSpaces(region);
}
ua = ua.replace("{language.and.region}", languageAndRegion);
return ua;
}
/**
* Replace any spaces in the input with underscores.
*
* @param input the input
* @return the input with spaces replaced by underscores
*/
private static String replaceSpaces(final String input) {
return input == null ? UNKNOWN : input.replace(' ', '_');
}
private static String getAdditionalJvmLanguages() {
StringBuilder versions = new StringBuilder();
concat(versions, scalaVersion(), " ");
concat(versions, clojureVersion(), " ");
concat(versions, groovyVersion(), " ");
concat(versions, jythonVersion(), " ");
concat(versions, jrubyVersion(), " ");
concat(versions, kotlinVersion(), " ");
return versions.toString();
}
private static String scalaVersion() {
return languageVersion("scala", "scala.util.Properties", "versionNumberString", true);
}
private static String clojureVersion() {
return languageVersion("clojure", "clojure.core$clojure_version", "invokeStatic", true);
}
private static String groovyVersion() {
return languageVersion("groovy", "groovy.lang.GroovySystem", "getVersion", true);
}
private static String jythonVersion() {
return languageVersion("jython", "org.python.Version", "PY_VERSION", false);
}
private static String jrubyVersion() {
return languageVersion("jruby", "org.jruby.runtime.Constants", "VERSION", false);
}
/**
* Attempt to determine if Kotlin is on the classpath and if so what version is in use.
* Can do this by either using the KotlinVersion class that was introduced in 1.1 or
* via looking at the JAR's manifest versions for earlier versions.
*
* @return Kotlin version if any, else empty string
*/
private static String kotlinVersion() {
String version = kotlinVersionByClass();
return version.equals("") ? kotlinVersionByJar() : version;
}
private static String kotlinVersionByClass() {
StringBuilder kotlinVersion = new StringBuilder("");
try {
Class versionClass = Class.forName("kotlin.KotlinVersion");
kotlinVersion.append("kotlin");
String version = versionClass.getField("CURRENT").get(null).toString();
concat(kotlinVersion, version, "/");
} catch (ClassNotFoundException e) {
//ignore
} catch (Exception e) {
if (log.isTraceEnabled()){
log.trace("Exception attempting to get Kotlin version.", e);
}
}
return kotlinVersion.toString();
}
private static String kotlinVersionByJar() {
StringBuilder kotlinVersion = new StringBuilder("");
JarInputStream kotlinJar = null;
try {
Class kotlinUnit = Class.forName("kotlin.Unit");
kotlinVersion.append("kotlin");
kotlinJar = new JarInputStream(kotlinUnit.getProtectionDomain().getCodeSource().getLocation().openStream());
String version = kotlinJar.getManifest().getMainAttributes().getValue("Implementation-Version");
concat(kotlinVersion, version, "/");
} catch (ClassNotFoundException e) {
//Ignore
} catch (Exception e) {
if (log.isTraceEnabled()) {
log.trace("Exception attempting to get Kotlin version.", e);
}
} finally {
closeQuietly(kotlinJar, log);
}
return kotlinVersion.toString();
}
/**
* Attempt to determine if this language exists on the classpath and what it's version is
* @param language the name of the language
* @param className a class of that lanauge that exposes runtime version information
* @param methodOrFieldName the static field or method name that holds the version number
* @param isMethod whether the above is a field or method
* @return the version number or empty string if the language does not exist on the classpath
*/
private static String languageVersion(String language, String className, String methodOrFieldName, boolean isMethod) {
StringBuilder sb = new StringBuilder();
try {
Class clz = Class.forName(className);
sb.append(language);
String version = isMethod ? (String) clz.getMethod(methodOrFieldName).invoke(null) : (String) clz.getField(methodOrFieldName).get(null);
concat(sb, version, "/");
} catch (ClassNotFoundException e) {
//Ignore
} catch (Exception e) {
if (log.isTraceEnabled()){
log.trace("Exception attempting to get " + language + " version.", e);
}
}
return sb.toString();
}
private static void concat(StringBuilder prefix, String suffix, String separator) {
if (suffix != null && !suffix.isEmpty()) {
prefix.append(separator).append(suffix);
}
}
}